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Clean Technologies and Environmental Policy

27-03-2024 | Original Paper

A simplified preparation of silica aerogel/epoxy composite coating based on rice husk ash for enhancing corrosion resistance

Authors: Xingxing Wang, Kaifa Du, Yi Jia, Wenxia Zhao, Ke Duan, Xiaoyu Wang, Ian Beadham, Jie Hu, Changbo Zhang, Yun Deng

Published in: Clean Technologies and Environmental Policy

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Abstract

Using rice husk ash as silicon source to prepare silica aerogels is one of the most possible ways to realize high value utilization of husk ash. However, the applications of rice husk ash-based silica aerogels (HSAs) using the conventional procedure (without incorporating special materials or processes) are limited due to their relatively inferior properties compared to silica aerogel prepared from conventional silicon sources. Therefore, it is necessary to explore new application areas where HSA can be competent. In this study, HSAs were prepared using a simple conventional protocol and utilized as fillers to enhance the corrosion resistance of epoxy coating. The results showed that the optimal HSA had a specific surface area of 470.3 m²/g and a water contact angle of 158.5°. The HSA/epoxy composite can be prepared simply using a magnetic stiran. When the addition amount is 6%, the coating has the best corrosion resistance. The protection efficiency remaining at 91.4%, after 20 days of immersion in a 3.5% NaCl solution, which was 48.7% for pure epoxy coating. The polarization resistance value was 7591.7% higher compared to pure epoxy coating. This performance was better than that reported for some conventional fillers in the literature. Besides the similar effect as other fillers, it is possible that the HSA may have trapped O₂ and Cl⁻, preventing them from contacting directly with the metal.

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Title: A simplified preparation of silica aerogel/epoxy composite coating based on rice husk ash for enhancing corrosion resistance
Authors: Xingxing Wang
Kaifa Du
Yi Jia
Wenxia Zhao
Ke Duan
Xiaoyu Wang
Ian Beadham
Jie Hu
Changbo Zhang
Yun Deng
Publication date: 27-03-2024
Publisher: Springer Berlin Heidelberg
Published in: Clean Technologies and Environmental Policy
Print ISSN: 1618-954X
Electronic ISSN: 1618-9558
DOI: https://doi.org/10.1007/s10098-024-02821-2